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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
PRB plans $ 4 $ 8 $ 13 $ 12  
Defined contribution plans 339 317 734 689  
Liability, Defined Benefit Plan, Current 270   270   $ 270
Liability, Defined Benefit Pension Plan, Noncurrent 2,264   2,264   2,385
Non-service pension income (374) (447) (760) (891)  
Marketable securities held in trusts 714   714   745
UNITED STATES          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plans 0 0 0 0  
Foreign Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plans 10 20 12 28  
Pension Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Assets for Plan Benefits, Defined Benefit Plan 1,906   1,906   1,296
Liability, Defined Benefit Pension Plan, Noncurrent 1,634   1,634   1,737
Service cost 47 56 94 111  
Interest cost 596 627 1,192 1,253  
Expected return on plan assets (936) (938) (1,873) (1,875)  
Amortization of prior service credit (42) (40) (85) (79)  
Recognized actuarial net (gain) loss 5 (95) 10 (190)  
Net settlement, curtailment, and special termination benefit (gain) loss 3 0 (4) 2  
Non-service pension income (374) (446) (760) (889)  
Total net periodic (income) expense (327) (390) (666) (778)  
Other Postretirement Benefits Plan [Member]          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Liability, Defined Benefit Pension Plan, Noncurrent 568   568   582
Service cost 1 1 2 2  
Interest cost 11 12 22 24  
Expected return on plan assets (5) (5) (10) (10)  
Amortization of prior service credit 0 0 0 0  
Recognized actuarial net (gain) loss (6) (8) (12) (16)  
Net settlement, curtailment, and special termination benefit (gain) loss 0 0 0 0  
Non-service pension income 0 (1) 0 (2)  
Total net periodic (income) expense 1 $ 0 2 $ 0  
Other pension and PRB related items          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Liability, Defined Benefit Pension Plan, Noncurrent $ 62   $ 62   $ 66